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Image: Washington Monument rubble at 150 feet

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Description: Cross section of rubble in shaft at 150 feet and typical of rubble below 150 feet
Title: Washington Monument rubble at 150 feet
Credit: To the immortal name and memory of George Washington: The United States Army Corps of Engineers and the Construction of the Washington Monument (page 75) http://www.publications.usace.army.mil/Portals/76/Publications/EngineerPamphlets/EP_870-1-21.pdf
Author: Anonymous
Permission: This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. See this page for further explanation. This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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